diff --git a/mpp/base/inc/kmpp_obj.h b/mpp/base/inc/kmpp_obj.h
index ca758f0b..6752fb80 100644
--- a/mpp/base/inc/kmpp_obj.h
+++ b/mpp/base/inc/kmpp_obj.h
@@ -130,7 +130,8 @@ typedef union KmppEntry_u {
         struct {
             EntryType       prop            : 4;
             EntryValFlag    flag            : 4;
-            EntryValUsage   usage           : 24;
+            EntryValUsage   usage           : 8;
+            rk_u32          reserve         : 16;
             rk_u32          val;
         } v;
         struct {